diff --git a/CMakeLists.txt b/CMakeLists.txt
index b9e7a949..5437f9ff 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -797,7 +797,6 @@ if(MGE_WITH_TEST AND MGE_ENABLE_RTTI)
     add_subdirectory(test)
 endif()
 
-
 if(TARGET _imperative_rt)
     add_custom_target(
         develop
diff --git a/imperative/CMakeLists.txt b/imperative/CMakeLists.txt
index fac4c060..e6c613a0 100644
--- a/imperative/CMakeLists.txt
+++ b/imperative/CMakeLists.txt
@@ -69,6 +69,7 @@ endif()
 add_custom_command(
     TARGET ${MODULE_NAME} POST_BUILD
     COMMAND ${CMAKE_COMMAND} -E copy ${PROJECT_SOURCE_DIR}/LICENSE ${PROJECT_SOURCE_DIR}/ACKNOWLEDGMENTS ${PROJECT_BINARY_DIR}
+    COMMAND ${CMAKE_COMMAND} -E remove -f ${CMAKE_CURRENT_SOURCE_DIR}/python/megengine/core/$<TARGET_FILE_NAME:${MODULE_NAME}> # clean develop
     COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_SOURCE_DIR}/python/megengine ${CMAKE_CURRENT_BINARY_DIR}/python/megengine
     COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_SOURCE_DIR}/python/test ${CMAKE_CURRENT_BINARY_DIR}/python/test
     COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/python/setup.py ${CMAKE_CURRENT_BINARY_DIR}/python/setup.py